Taxonomy of Dactylella complex and Vermispora. I. Generic concepts based on morphology and ITS sequences data
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1 Taxonomy of Dactylella complex and Vermispora. I. Generic concepts based on morphology and ITS sequences data Juan Chen 1,2, Ling-Ling Xu 1,2, Bin Liu 1,3 and Xing-Zhong Liu 1* 1 Key Laboratory of Systematic Mycology & Lichenology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 080, PR China 2 Graduate School, Chinese Academy of Sciences, Beijing 039, PR China 3 Institute of Applied Microbiology, Agricultural College of Guangxi University, Nanning , PR China Chen, J., Xu, L.L., Liu, B. and Liu, X.Z. (2007). Taxonomy of Dactylella complex and Vermispora. I. Generic concepts based on morphology and ITS sequences data. Fungal Diversity: 26: Dactylella, anamorphic Orbiliaceae (Ascomycetes) and related genus Vermispora are systematically studied and are revised according to morphology and phylogenetic analyses of ITS1-5.8S-ITS2 rdna sequences. Thirty-nine isolates formerly assigned to Dactylella and Vermispora, including 28 from the Centraalbureau voor Schimmelcultures and 11 from our laboratory were studied. Based on ITS sequence alignment, all the tested strains cluster into three monophylogenic clades corresponding to three genera, e.g. Dactylella, Vermispora and a distinct group comprising species with very short conidiophores. The circumscription of Dactylella and Vermispora are emended and a new genus Brachyphoris is introduced. Key words: Brachyphoris gen. nov., classification, Dactylella, phylogeny, teleomorphanamorph connection, Vermispora Introduction Dactylella was established by Grove (1884) on the basis of one species, D. minuta Grove. The genus was characterized as Saprophytic. Vegetative hyphae creeping, sparse. Conidiophores erect, simple, septate or non-septate, smooth, hyaline. Conidia borne singly at the apex of conidiophores, ellipsoidal or fusoid or cylindrical, one-celled at first, later 2- to many-septate, hyaline. According to Grove s initial description, D. minuta was incapable of preying on nematodes, however, this genus had been emended several times in subsequent years and both non-predacious and predacious fungi had been included in the genus (Subrammanian, 1963; Schenck et al., 1977; Hoog and Oorschot, 1985; Zhang et al., 1994). Rubner (1996) revised the generic concept * Corresponding author: X.Z.Liu; liuxz@sun.im.ac.cn 73
2 of Dactylella and excluded the nematode-trapping species. However, the classification has not commonly been accepted and several predacious species had been described under Dactylella (Liu et al., 2003; Zhang et al., 2005). Dactylella includes diverse taxa in morphology and behaviour. There are considerable differences in conidiophore length and conidial size among species. Some species are saprotrophic, while others are oospore or nematodeegg parasites (Zhang et al., 1994). Vermispora was introduced by Deighton and Pirozynski (1972) with the type species V. grandispora, a parasite of the leaf-inhabiting Irenopsis aciculosae (Meliolaceae) in Sierra Leone. Species in Vermispora were defined as having hyaline conidiophores which proliferate in a sympodial manner and terminate with slightly curved fusiform conidia. Burghouts and Gams (1989) compared Vermispora fusarina Burghouts & W. Gams with Dactylella oviparasitica G.R. Stirling & R. Mankau. Liu et al. (2005) discussed the relationship of Vermispora fusarina, Dactylella oviparasitica and D. brevistipitata B. Liu, Xing Z. Liu & W.Y. Zhuang according to phylogenetic analysis of ITS sequences, however a thorough revision involving more species in Dactylella and Vermispora is still needed. In view of vast biological differences in species of Dactylella and the complicated relationship between Dactylella and Vermispora, a systematic study dealing with these fungi has been conducted. Materials and methods Fungal isolates Thirty-two isolates of available strains representing 22 worldwide species were sequenced in this study (Table 1). Generally, cultures grew on PDA plates at 25ºC or were stored in glycerol at 80ºC. Extraction of genomic DNA DNA was extracted from pure cultures following the method of Liu et al. (2005) with modification. The isolates were inoculated on a disc of cellophane (5 cm diam.) which was placed on the surface of a PDA plate and incubated at 25ºC for 10 days. Ten - 50 mg of fresh mycelium were scraped from the cellophane and placed in a 1.5 ml eppendorf tube containing 1 mg sterile siliceous sand, 1 mg polyvinylpyrrolidone (PVP) and 150 µl CTAB buffer ( mm Tris, ph 8.5; 1.4 M NaCl; 20 mm EDTA; 2% CTAB), the mixture was crushed with a glass pestle and then supplemented with 450 µl CTAB buffer, 74
3 incubated at 65 C for 60 minutes. This was followed by mixing with equal volume of phenol:chloroform:isoamyl alcohol at the ratio of 25:24:1 and centrifuging at rpm for 10 minutes. The DNA in supernatant was then precipitated by isopropanol at 20 C for 30 minutes, washed with 70% ethanol, and resuspended into 50 µl sterile distilled water. PCR amplification and DNA sequencing Ribosomal DNA from the 5 end of ITS1 to the 3 end of ITS2 region was defined by primers ITS1 and ITS4 (White et al., 1990) and amplified by polymerase chain reaction (PCR) with the procedure of denaturing at 95 C for 3 minutes, followed by 34 cycles at 94 C for 1 minute, 54 C for 40 seconds and 72 C for 1 minute, then a final extension at 72 C for 10 minutes after cycling. A portion (2 µl) of the amplified product was electrophoresed in 0.5% TAE buffer (40 mm Tris-acetate, 1 mm EDTA, ph 8.0) at 120 V for 30 minutes. The gel was stained with ethidium bromide (0.5 g/ml), examined under a UV light and photographed. The PCR product was purified by Go3S PCR Product Purification Kit (Shenergy Biocolor BioScience and Technology Company, Shanghai, China), and sequenced on an automated ABI 377 sequencer (Perkin Elmer) by the same company. Phylogenetic analysis Sequences for each strain together with reference sequences obtained from GenBank (Table 1) were aligned using Clustal X (Thomson et al., 1997). Alignment was manually adjusted where necessary with MEGA version 3.0 (Kumar et al., 2004). Cladistic analyses using the neighbor-joining method (Saitou and Nei, 1987) was performed with the same program. The neighborjoining tree was constructed with Kimura 2-parameter model, including transitions and transversions and with pairwise deletion of gaps. Clade stability was assessed in a bootstrap analysis with 0 replicates. Results A phylogenetic analysis using ITS1-5.8S-ITS2 rdna sequences of Datylella and Vermispora species was conducted. The matrix contained 38 sequences including 7 from GenBank. There are 3 main clades in the phylogenetic tree with rather high bootstrap value (Fig. 1). One clade (Dactylella group) is well in accordance with Dactylella with the exception of Dactylella spermatophaga Drechsler, D. oviparasitica, D. brevistipitata and D. 75
4 Table 1. List of taxa used in this study. Specimen voucher CBS Taxon Substrates Location GeneBank accession number D. intermedia T.F. Lei & X.Z. Litter Oman DQ Liu CBS D. oxyspora Sacc. & Marchal Leaf litter Spain DQ CBS D. arnaudii Yadav Dead stems UK DQ CBS D. oxyspora Sacc. & Marchal Root Netherlands DQ CBS D. clavata Gao, Sun & Liu Soil of Cocos China, AY nucifera Hainan CBS D. oxyspora Sacc. & Marchal Agricultural soil Netherlands DQ CBS D. spermatophaga Drechsler Oospore USA DQ CBS D. oxyspora Sacc. & Marchal Old stem Germany AY CBS D. oxyspora Sacc. & Marchal Rabbit pellet Netherlands DQ CBS D. atractoides Drechsler Dead stem Netherlands DQ CBS D. cylindrospora R.C. Cooke Soil Western AF Samoa CBS D. oviparasitica Stirling & Nematode eggs Netherlands AY Mankau CBS D. oviparasitica Stirling & Nematode eggs Netherlands DQ Mankau CBS D. oviparasitica Stirling & Nematode eggs Netherlands DQ Mankau CBS D. oviparasitica Stirling & Nematode eggs USA AY Mankau CBS D. ramosa Matsushima Leaf Cuba DQ CBS V. fusarina Burghouts & W. Egg of Globodera Netherlands DQ Gams pallida CBS A V. fusarina Burghouts & W. Egg of Globodera Netherlands DQ Gams pallida CBS B V. fusarina Burghouts & W. Egg of Globodera Netherlands DQ Gams pallida CBS D. rhopalota Drechsler Wood Netherlands DQ CBS D. oxyspora Matsushima Soil USA DQ CBS D. rhopalota Drechsler Decaying wood Netherlands DQ CBS D. rhopalota Drechsler Needle of Pinus sp. Netherlands DQ CBS D. rhopalota Drechsler Sweden DQ CBS D. tenuifusaria Liu, Gao, Forest soil China, DQ Zhang & Cao Guizhou CBS D. clavispora chen, Xu, Liu Living leaf UK DQ & Liu CBS D. rhopalota Drechsler Living leaf UK DQ CBS Orbilia coccinella Fries AY
5 Table 1. List of taxa used in this study. Specimen voucher YMF Taxon Substrates Location GeneBank accession number D. zhongdianensis Zhang et Soil China, Yunnan DQ al. YMF D. panlongna Liu & Zhang Soil China, Yunnan DQ YMF D. yunnanensis Zhang, Liu & Soil China, Yunnan DQ Cao SDT-2-34 D. clavata Gao, Sun & Liu Soil China, Yunnan AS D. tenuis Drechsler Soil China, Xinjiang DQ AS D. xinjiangensis chen, Xu, Soil China, Xinjiang DQ Liu & Liu AS D. heptameres Drechsler Soil China, Beijing DQ AS D. heptameres Drechsler Soil China, Beijing DQ AS D. brevistipitata Liu, Liu & Soil China, Beijing AY Zhuang AS V. leguminacea chen, Xu, Liu Soil China, Fujian DQ & Liu AS V. leguminacea chen, Xu, Liu & Liu Soil China, Fujian DQ tenuifusaria Xing Z. Liu, R.H. Gao, K.Q. Zhang & L. Cao. One clade (Vermispora group) includes species of Vermispora plus Dactylella spermatophaga. The third clade (Brachyphoris group) comprises Dactylella oviparasitica, D. brevistipitata and D. tenuifusaria, three species which obviously differ morphologically from the type species D. minuta. According to the molecular and morphological analysis, circumscriptions of Dactylella and Vermispora are emended and the new genus Brachyphoris with type species Brachyphoris oviparasitica is proposed. Anamorphic genera of Orbiliaceae Dactylella Grove, Journal of Botany 22: 195, = Drechslermyces Subrammanian, Kavaka 5: 93-97, = Gangliophragma Subrammanian, Kavaka 5: 93-97, = Lactydina Subrammanian, Kavaka 5: 93-97, = Kafiaddinia Mekhtieva, Khishchnye nematofagovye Griby-Gi-fomitsety: 123,
6 90 96 D. oxysporacbs D. oxysporacbs D. oxysporacbs D. oxysporacbs D. oxysporacbs D. oxysporaay D. arnaudiicbs D. yunnanensisymf D. clavisporacbs D. rhombosporacbs D. heptameresas D. heptameresas D. intermediacbs D. tenuisas D. clavataay D. xinjiangensisas D. ramosacbs D. panlongnaymf D. cylindrosporaaf D. zhongdianensisymf D. rhopalotacbs D. rhopalotacbs D. rhopalotacbs D. rhopalotacbs D. rhopalotacbs V. spermatophagacbs V. leguminaceaas V. leguminaceaas V. fusarinacbs V. fusarinacbs383.84a V. fusarinacbs383.84b C. B. tenuifusariacbs B. brevistipitataay B. oviparasiticaay B. oviparasiticacbs B. oviparasiticacbs B. oviparasiticaay Dactylaria purpurellaay Dactylella Vermispora Brachyphoris gen. nov Fig. 1. Neighbor-joining tree inferred from the ITS1-5.8S-ITS2 rdna. Colonies white. Vegetative hyphae hyaline, thin-walled, septate. Conidiophores long, hyaline, simple, septate, solitary, erect or branched. Conidia hyaline, thin-walled, fusiform, clavate or ellipsoidal, borne singly at the apex of the conidiophores and on short branches. Type species: Dactylella minuta Grove 78
7 Brachyphoris J. Chen, L.L. Xu, B. Liu & Xing Z. Liu, gen. nov. MycoBank: Etymology: The epithet refers to the very short conidiophores. Conidiophora inconspicua, conidio vix longiora, simplicia vel interdum ramosa, vulgo solitaria vel pauce aggregata. Conidium unum vel interdum duo gerentia. Conidia hyalina, fusiformia vel filiformia, recta vel leviter curvata. Conidiophores simple or occasionally branched, hyaline, very short, scarcely longer than conidia. Conidiophore mostly produces a single conidium, sometimes two conidia. Conidia hyaline, smooth-walled, spindle-shaped, filiform or elongate fusoid, straight or slightly curved. Type species: Brachyphoris oviparasitica (G.R. Stirling & R. Mankau) J. Chen, L.L. Xu, B. Liu & Xing Z. Liu, comb. nov. MycoBank: = Dactylella oviparasitica G.R. Stirling & R. Mankau, Mycologia 70: 777, Vermispora Deighton & Pirozynski, Mycological Papers 128: 87, Colonies white to salmon. Hyphae colourless, septate, branched. Conidiophores borne as lateral branches of the mycelial hyphae, colorless, simple, smooth, thin-walled, slightly geniculate above the old conidial scars. Conidial scars inconspicuous, truncate, unthickened. Conidia colourless, long cylindric to fusiform, obclavate or elongate fusoid, smooth, thin-walled, slightly curved and usually slightly sigmoid. Type species: Vermispora grandispora Deighton & Pirozynski Key to anamorphic genera of Orbiliaceae 1. Trapping nematodes with trapping devices No trapping devices formed Trapping nematodes with adhesive networks... Arthrobotrys 2. Trapping nematodes with other devices Trapping nematodes with constricting rings... Drechslerella 3. Trapping nematodes with adhesive knobs or non-constricting rings...dactylellina 4. Conidia forked Conidia not forked Conidia with a main axis bearing two divergent radiate arms Conidia branched dichotomously twice at the apex, with a cylindric-ellipsoidal main axis and four curved and tapering side arms... Dwayaangam 6. Conidia bilobate, lobes parallel, U-shaped or Y-shaped... Dicranidion 6. Conidia triradiate, Y-shaped or T-shaped...Trinacrium 79
8 7. Conidia sigmoid to coiled Conidia not sigmoid Conidia falcate... Idriella 8. Conidia straight, fusiform or cylindrical or clavate Conidiophores long, straight or occasionally branched...dactylella 9. Conidiophores scarcely longer than conidia... Brachyphoris 10. Conidia coiled in three dimensions... Helicoon 10. Conidia vermiform to sigmoid...anguillospora Discussion Species in Dactylella form a polyphyletic group and disperse into three clades, indicating that Dactylella is a phylogenetically heterogeneous group. Molecular phylogeny has demonstrated that the morphological criteria formerly considered important in defining Dactylella and related genera could be inadequate. The Dactylella clade includes the type species and is characterized by erect, long conidiophores producing multiseptate, clavate, fusiform or cylindrical conidia. Interestingly, Dactylella spermatophaga, D. oviparasitica, D. brevistipitata and D. tenuifusaria previously assigned to Dactylella are excluded by the molecular data. Our subsequent morphological analysis is in full agreement with the molecular analysis. The living culture of D. spermatophaga (CBS ) is characterized by elongate spindle-shaped, curved conidia, borne successively on procumbent conidiophores. Both the morphology of conidia and conidiophores indicate its taxon should be accommodated in Vermispora. Dactylella oviparasitica, D. brevistipitata and D. tenuifusaria produce very short conidiophores (no longer than the conidia), and the colony configuration differs considerably from other species in Dactylella. Considering the great discrepancy in morphology as well as molecular evidence, we consider that the feature of short conidiophores represents an important characteristic to delimit these taxa into a new genus Brachyphoris. The Vermispora clade comprises species of Vermispora and Dactylella spermatophaga. Since being established in 1972, only 4 species have been reported in Vermispora, all of which bear elongate-fusoid conidia on procumbent conidiophores. Dactylella spermatophaga was described as conidia elongate spindle-shaped, slightly curved; conidiophores repeatedly elongated, give rise at successive intervals to 10 or 15 additional conidia (Drechsler, 1938). According to this description and our detailed observation 80
9 of the living culture (CBS ), we reclassify D. spermatophaga in Vermispora under the new name Vermispora spermatophaga. Dactylella oviparasitica, D. brevistipitata and D. tenuifusaria formed a monophyletic group adjacent to the Dactylella and Vermispora clades. Since this group differs from Dactylella in morphology and molecular data, we proposed a new genus for this clade. Brachyphoris gen. nov. is characterized by very short conidiophores and Dactylella oviparasitica, D. brevistipitata, D. tenuifusaria, D. helminthodes Drechsler and D. stenomeces Drechsler are transferred. The connection between anamorphs and teleomorphs has been reported in taxonomy of filamentous fungi (Pfister, 1997; Kohlmeyer et al., 1998; Liu et al., 2005). Mo et al. (2005) listed the anamorphs of Orbilia and concluded three connections between Orbilia and Dactylella. Yang and Liu (2005) reported Dactylella coccinella Y. Yang & Xing Z. Liu as anamorph of Orbilia coccinella. Since then 4 species of Dactylella have been connected with Orbilia (Zachariah, 1989; Pfister, 1997; Webster et al., 1998; Yang and Liu, 2005). One Brachyphoris species has been connected to Hyalorbilia (Liu et al, 2005) (Table 2). From the phylogenetic tree, the teleomorphs of the three anamorph genera should be orbiliacous fungi. Although some more new species of Orbilia and Hyalorbilia have been reported recently (Liu et al., 2006; Wu et al., 2007), no teleomorph is yet known for Vermispora. Orbilia (Fr.) Fr. and Hyalorbilia Baral & G. Marson are the only two genera of Orbiliaceae recognized, which differ considerably in morphological and molecular characteristics (Baral, 2001; Liu et al., 2005). The relationship between Orbilia and Dactylella, Hyalorbilia and Brachyphoris may partly indicate their diverse taxonomic positions. Table 2. Anamorph-teleomorph connection. Anamorph Teleomorph Reference and author Dactylella D. rhopalota O. sp. Zachariah (1989) D. sp. O. alnea Pfister (1997) D. cf. oxyspora O. fimicoloides Webster et al. (1998) D. coccinella O. coccinella Yang et al. (2005) Brachyphoris B. brevistipitata H. brevistipitata Liu et al. (2005) 81
10 Acknowledgements We thank K.Q. Zhang for kindly providing fungal material and J.Y. Zhuang for correcting the Latin diagnoses. This project is supported by the National Natural Science Foundations of China (nos ). References Baral, H.O. and Marson, G. (2001). Monographic revision of Gelatinopsis and Calloriopsis (Calloriopsideae, Leotiales). Micologia 2000: Associazione Micologica Bresadola, Trento. Burghout, T.H. and Gams, W. (1989). Vermispora fusarina, a new hyphomycete parasitizing cyst nematodes. Memoirs of The New York Botanical Garden 49: De Hoog, G.S. and Van Oorschot, C.A.N. (1985). Taxonomy of the Dactylaria complex. Studies in Mycology 26: Deighton, F.C. and Pirozynski, K.A. (1972). Micro-fungi. V. More hyperparasitic Hyphomycetes. Mycological Papers 128: Drechsler, C. (1938). Two hyphomycetes parasitic on oospores of root-rotting oomycetes. Phytopathology 28: Drechsler, C. (1943). A new nematode-capturing Dactylella and several related hyphomycetes. Mycologia 35: Drechsler, C. (1963). A slender-spored Dactylella parasitic on Pythium oospores. Phytopathology 53: Drechsler, C. (1952). Another nematode-strangulating Dactylella and some related hyphomycetes. Mycologia 44: Grove, W.B. (1884). New or noteworthy fungi. Journal of Botany 22: Kohlmeyer, J., Baral, H.O., and Volkmann-Kohlmeyer, B. (1998). Fungi on Juncus roemerianus. 10. A new Orbilia with ingoldian anamorph. Mycologia 90: Kumar, S., Tamura, K. and Nei, M. (2004). MEGA3: An integrated software for molecular evolutionary genetics analysis and sequence alignment. Briefings in Bioinformatics 5: Liu, B., Liu, X.Z. and Zhuang, W.Y. (2005). A new species of Hyalorbilia and its anamorph from China. Nova Hedwigia 81: Liu, B., Liu, X.Z. and Zhuang, W.Y. (2005). Orbilia querci sp. nov. and its knob-forming nematophagous anamorph. FEMS Microbiology Letters 245: Liu, B., Liu, X.Z., Zhuang, W.Y. and Baral, H.O. (2006). Orbiliaceous fungi from Tibet, China. Fungal Diversity 22: Liu, X.F. and Zhang, K.Q. (2003). Dactylella shizishanna sp. nov., from Shizi Mountain, China. Fungal Diversity 14: Liu, X.Z., Gao, R.H., Zhang, K.Q. and Cao, L. (1996). Dactylella tenuifusaria sp. nov., a rhizopod-capturing hyphomycete. Mycological Research : Matsushima, T. (1971). Microfungi of the Solomon Islands and Papua-New Guinea. Kobe, Japan. Mekhtieva, N.A. (1979). Khishchnye nematofagovye Griby-Gifomitsety (Predaious nematophagous hyphomycetes). Akademiya Nauk Azerbaidzhanskoi SSR, Baku. Mo, M.H., Huang, X.W., Zhou, W., Huang, Y., Hao, Y.E. and Zhang K.Q. (2005). Arthrobotrys yunnanensis sp. nov., the fourth anamorph of Orbilia auricolor. Fungal Diversity 18:
11 Pfister, D.H. (1997). Castor, Pollux, and the life histories of fungi. Mycologia 89: Rubner, A. (1996). Revision of predacious hyphomycetes in the Dactylella- Monacrosporium complex. Studies in Mycology 39: Saitou, N. and Nei, M. (1987). The neighbour-joining method: a new method for reconstructing phylogenetic trees. Molecular Biology and Evolution 4: Schenck, S., Kendrick, W.B. and Pramer, D. (1977). A new nematode-trapping hyphomycete and a reevaluation of Dactylaria and Arthrobotrys. Canadian Journal of Botany 55: Stirling, R.G. and Mankau, R. (1978). Dactylella oviparasitica, a new fungal parasite of Meloidogyne eggs. Mycologia 70: Subramanian, C.V. (1963). Dactylella, Monacrosporium and Dactylaria. Journal of the Indian Botanical Society 42: Subramanian, C.V. (1977). Revisions of hyphomyetes-i. Kavaka 5: Thakur, S. and Zachariah, K. (1989). Response of the fungus Dactylella rhopalota to bacteria. Plant and Soil 120: Thompson, J.D., Gibson T.J., Plewniak, F., Jeanmougin, F. and Higgins, D.G. (1997). The Clustal_X windows interface: Flexible strategies for multiple sequence alignment aided by quality analysis tools. Nucleic Acids Research 25: Webster, J., Henrici, A. and Spooner, B.M. (1998). Orbilia fimicoloides sp. nov., the teleomorph of Dactylella cf. oxyspora. Mycological Research 102: White, T.J., Bruns, T., Lee, S. and Taylor, J. (1990). Amplification and direct sequencing of fungal ribosomal RNA genes for phylogenetics. Chapter 38. In: PCR Protocols: A Guide to Methods and Applications (M. Innis, D. Gelfand, J. Sninsky and T. White, eds.). Academic Press, Orlando, Florida. Wu, M.L., Su, Y.C., Baral, H.O and Liang, S.H. (2007). Two new species of Hyalorbilia from Taiwan. Fungal Diversity 25: Yadav, A.S. (1960). Dactylella arnaudii sp. nov. Transactions of the British Mycological Society 43: Yang, Y. and Liu, X.Z. (2005): Datylella coccinella sp. nov., anamorphic species. Mycotaxon 91: Zhang, J., Mo, M.H., Deng, J.S., Liu, X.F., Bi, T.J. and Zhang, K.Q. (2005). Dactylella zhongdianensis sp. nov., a new predacious antagonist of nematodes. Mycotaxon 92: Zhang, K.Q., Liu, X.Z. and Cao, L. (1994). A review of Dactylella and a new species. Mycosystema 7: (Received 24 June 2006; accepted 17 April 2007) 83
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